New and undisclosed security measures will be imposed on airports flying passengers from Europe to the United States, amid concerns of increased risk of attack from al-Qaeda or other Islamist-affiliated groups.
Security will be tightened here in the UK, but the threat level has not been altered, the government said.
US security officials believe that the threat of new types of bombs being smuggled on board planes has grown, but would not give details on what exactly has triggered the precautions.
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State Department spokeswoman Heather Nauert said Pence "was ready to take this opportunity."